Different configurations, too. Landing and takeoff will create different amounts and durations of wake vortices, with initial take off and climb producing stronger and longer lasting vortices than landing.
Note also that the MIA
747 is a 400 model with wingtips. That will help reduce vortices to some extent as well. The photo in question is a 200 model with no wingtips.
I think it's a great catch and someone is jealous that they didn't get such a spectacular shot!